high expression of Cystatin SN is a significant prognostic indicator of a higher rate of recurrence, metastatic risk, and poor survival in patients with surgically resected NSCLCs.

In conclusion, our data suggest that CST1 might contribute to the proliferation of pancreatic cancer cells and could be a potential biomarker for the early detection of pancreatic cancer.

CST1 may contribute to inactivation of protease allergens and help re-establish homeostasis of the nasal membranes.

CST1 expression at both the messenger RNA and protein levels was barely detected in control cells, which included early passage proliferating, quiescent, or immortal human fibroblasts

Murine monoclonal antibodies were made which can distinguish between CST1 and CST2 (show CST2 ELISA Kits).

CST1 might be highly involved in gastric tumorigenesis and regulate the proteolytic activity of cysteine proteases.

Cystatin SN (CST1) Antigen Profile

Antigen Summary

The cystatin superfamily encompasses proteins that contain multiple cystatin-like sequences. Some of the members are active cysteine protease inhibitors, while others have lost or perhaps never acquired this inhibitory activity. There are three inhibitory families in the superfamily, including the type 1 cystatins (stefins), type 2 cystatins and the kininogens. The type 2 cystatin proteins are a class of cysteine proteinase inhibitors found in a variety of human fluids and secretions, where they appear to provide protective functions. The cystatin locus on chromosome 20 contains the majority of the type 2 cystatin genes and pseudogenes. This gene is located in the cystatin locus and encodes a cysteine proteinase inhibitor found in saliva, tears, urine, and seminal fluid.